“These ads are, were and always will be political ads using taxpayers’ money,” he said.

“Once again Mr Barnett has broken his promise, he’s wasting taxpayers’ money and it shows his overwhelming focus on the central business district of Perth to the detriment of the suburbs and towns of this State.”

Mr McGowan said $2 million spent on the Bigger Picture campaign and a separate Royalties for Regions ad campaign outside Perth should have been footed by the Liberals and Nationals.

The Bigger Picture ads summarise a range of major current and future works around Perth and direct viewers to a website containing traffic information and other information.

A Government spokeswoman said the ads had been extended for three weeks because of the significant roadworks currently underway or scheduled to start shortly.

“It is not political advertising. The information campaign helps commuters to be informed about traffic disruptions,” she said.